Two former Parramatta Eels players are accused of harbouring semi-automatic weapons and possessing more than half-a-million dollars in cash after dramatic arrests in Sydney's Centennial Park yesterday.

Hakea 'least worst' for WA juveniles

Western Australia could not have kept open a second juvenile detention facility purely as a contingency for an event like the Banksia Hill riot in January, a court has heard.

WA's Supreme Court heard final submissions on Monday in a hearing questioning the relocation of young offenders from Banksia Hill, the state's only juvenile detention facility, to the nearby Hakea adult prison after 108 of 240 cells were trashed in a rampage by inmates.

The court is looking at whether the decision, made in the early hours of January 21, breached provisions of the Young Offenders Act relating to the suitability of alternative places of detention for young offenders.

Lawyers acting on behalf of the family of one of the juveniles, who brought the action, said it was relevant to ask why there was no alternative to Hakea.

The court has heard other facilities were considered but deemed inappropriate, including the now-closed Rangeview Remand Centre for young offenders, now known as Wandoo, which was described as a "building site".

The lack of viable alternatives to Hakea was "something the state has brought about itself", lawyers for the applicants said.

"It is the state that has found itself in this position as a result of its decisions," they said.